How to disable AAAA queries for IPv6 / configure your resolver

Today I stumbled upon a very nasty behaviour of glibc - again.

On a host which has no access to IPv6 at all and no module-support in the kernel, it seems the connect() call fails when there is a AAAA record in place for a remote server.

This means I cannot wget a webpage if an AAAA record exists for the page, etc.

You will find many solutions on how to 'disable IPv6' - but they all miss the resolver in glibc, the part that is behind the 'gethostbyname' call.

I like to disable AAAA DNS-queries for IPv6 completely - and the solution is easy:

#cat /etc/resolv.conf 
options no-inet6
nameserver ...
nameserver ...

Just documenting it here, because the manpage does not document the 'no'-Feature and searching for this on google was not helpful at all.

obfuscated bash contest...

Guess what this (bash) one-liner does:

bc <<< `tar -c /tmp/a /tmp/b  2>/dev/null | xxd | \
awk '{print $10}' | tr -d '\n' | \
sed -n 's|^.*[0-9]\{7\}\.[0-9]\{7\}\.[0-9]\{7\}\.000000\
00000\.\(.*\)\.[0-9]\{6\}.*[0-9]\{7\}\.[0-9]\{7\}\.[0-9]\{7\}\.000000\
00000\.\([0-9]\{11\}\)\.[0-9]\{6\}.*$|\1 - \2|p' `

In my case it just printed -5... ;o)

The superfluous first post

   Blog myblog = com.blogger.createBlog("superfluousandsparse");
   Post firstpost=new BlogPost();
   firstpost.setTitle("The superfluous first post");
   //TODO: Fix the recursion....
   firstblog.setContent("Blog myblog = com.blogger.createBlog(\"superfluousand....");
   myblog.publish(firstpost);